Preparation of graphene oxide-coated silk fibers through HBPAA [a molecular glue]-induced layer-by-layer self-assembly
Preparation of graphene oxide-coated silk fibers through HBPAA [a molecular glue]-induced layer-by-layer self-assembly
复制标题
DOI：
10.1007/s13738-017-1213-y
复制
发表时间：
2017
影响因子：
2.4
通讯作者：
Jiangchao Song;Sijun Xu;T. Chen;S. Yamanaka;H. Morikawa
中科院分区：
文献类型：
--
作者：
Jiangchao Song;Sijun Xu;T. Chen;S. Yamanaka;H. Morikawa
碳纳米材料由于其独特的物理化学性质，在复合纳米材料中具有良好的应用前景，近年来引起了人们的广泛关注。本研究利用HBPAA诱导的层层自组装技术制备了氧化石墨烯（GO）包覆的丝纤维。采用超支化聚酰胺-胺（HBPAA）与丝素的溶液循环孵育，HBPAA作为“分子胶”，将单层或多层丝素与丝素纤维表面结合，形成紧密粘附的丝素涂层。在实验中，通过改进的Hummers方法合成了纳米片，并通过原子力显微镜、透射电子显微镜、X射线衍射和X射线光电子能谱对其进行了表征。我们开发的技术能够将纤维紧密地结合在丝绸表面并控制其负载能力。由于HBPAA分子带正电荷和丰富的氨基端基，故HBPAA可完全吸附在蚕丝表面。因此，它们的组装将是绿色和可控的。傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）、X射线衍射（XRD）、热重分析（TGA）等测试手段证实了HBPAA与聚丁二烯的结合。场使命扫描电镜（FESEM）结果表明，随着包覆层密度的增加，丝素纤维表面出现少量堆积，但包覆层在丝素纤维表面紧密铺展，无自折叠现象。LbL自组装技术的发展为在生物纤维和石墨烯基功能材料表面包覆纳米纤维提供了一种可控的途径。
Carbon nanomaterials recently gained extensive interests for their good application potential in composite nanomaterials because of their unique physicochemical properties. In this study, graphene oxide (GO)-coated silk fibers were fabricated through HBPAA-induced layer-by-layer (LbL) self-assembly technology. The closely adhered GOs coatings were achieved by circular incubation with solutions of hyperbranched poly (amidoamine) (HBPAA) and GOs, with HBPAA serving as the “molecular glue” that could bind single or mutilayered GOs to the surface of silk fibers. In the experiments, GOs nanosheets were synthesized by a modified Hummers method and were characterized by atomic force microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Our developed technology was able to tightly bind GOs to the silk surface and control their loading capacity. Owing to the positive charges and abundant amino end groups of HBPAA, GOs were found to be completely adsorbed onto silk surface. Therefore, their assembly would be green and controllable. The Fourier transform infrared (FTIR) spectroscopy, XPS, XRD, Thermogravimetric analyses (TGA) confirmed the attachment of HBPAA and GOs. Field mission scanning electron microscopy (FESEM) indicated that GOs closely spread on the surface of silk fibers without any self-folding though excessive stacking were observed in a small part of a silk surface with the increased density of GOs coatings. The developed LbL self-assembly technology may provide a controllable approach to coat GOs on the surface of biological fibers and graphene-based functional materials.